Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment SAFETY RUN-IN: Has received a live vaccine within 30 days prior to the first dose of trial treatment RANDOMIZED PHASE II CLINICAL TRIAL: Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial drug. Has received a live vaccine within 30 days prior to the first dose of trial treatment Live vaccine within 4 weeks of the first dose of pembrolizumab and while on trial is prohibited Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Have received a live vaccine within 30 days prior to the first dose of trial treatment. Received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Subject has received a live vaccine within 30 days prior to the first dose of trial treatment Have received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment. Is known to have received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment The participant has received a live vaccine within 30 days prior to the first dose of trial treatment. Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Patients who have received a live vaccine within 30 days prior to the first dose of trial treatment. Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment Has received a live vaccine within 30 days prior to the first dose of trial treatment